TAB. XVI. 



1. Natica Guillemini, page 142. 



a. back view. 



b. front view. 



2. Natica clausa, p. 147. 



a. back view. 



b. front view. 



3. Natica helicoides, /;. 145. 



a. back view. 



b. front view. 



4. Natica proxima, p. 143. 



a. back view. 



b. front view. 



5. Natica hemiclausa, /j. 144. 



a. back view. 

 £. front view. 



6. Natica varians, p. 143. 



a. front view. 



b. back view. 



Fig. 



7. Natica cirriformis, p. 145. 



tf. back view. 

 b. front view. 



8. Natica catena, jo. 142. 



a. back view. 

 3. front view. 



9. Natica multipunctata, p. 148. 



a. back view of spotted specimen. 



b. front view, same specimen. 



c. specimen with operculum in 



situ. 



d. front view of var. )3, from Cor. 



Crag. 



e. back view of same specimen. 

 /. operculum, from Cor. Crag. 



10. Natica catenoides, jo. 141. 



a. back view. 



b. front view. 



